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i @Blotter tatrs gleitet @fge N. GRAY BARTLETT, oF-KEoKUK, IOWA. LetterslPatcnt No. 73,284, dated January 14, 1868.

IMPROVEMENT IN INKSTANDS.

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TO -ALII WHOM IT MAY OONCERN:

Be it known that I, N. GRAY BARTLETT, of' Keokuk, Leo county, Iowa, have invented a new and improved Fountain-Iukstand; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the sauiefrefere-nce being had to the accompanying drawings, forming part of th'is specification.

My improvements consist in the employment of an overilow-chamber, in connection with a fountain-inkstand, and in the peculiar arrangement ofthe pen-oriiice or fountain-tubc.

, The overflow-chamber is so disposed in the inkstand that its bottom, or iloor, is continuous with the upper margin ofthe duct leading from the reservoir to the pen-orice or fountain-tube, sothat when any expansion of air confined in the reservoir takes place, the ink thereby displaced will be received in the overflow-chamber, whence, upon contraction of the confined air, it willreturn through the duct to the reservoir.

The pen-orifice or fountain-tube in my improvement slopes upward at an angle of about forty-five degrees to the perpendicular face of the inkstand. By this arrangement, conveniencein use and facility in filling the inkstand aresecured, while the perpendicular relation of the orifice to the base tends to exclude dust and dirt. In the accompanying drawingsy Figure I is a top view of my improved' fountain-inkstand.

Figure fl is a horizontal section thereof atline :z: a: of fig. 4.

Figure 3 is a vertical sectionl thereof at line y y ofg. 2; and

Figure 4 is a'vertcal section at line z z, also if fig. 2;

Similar letters of reference indicate corresponding parts.

A is the frame or stand; B, the closed reservoir, hermetically sealed to the vessel l, the floor whereof, at

t', is level with that of the duct C. D is the overow-chambcr, having its door above the level of that of the duct C, as shown vin g. 4, and open to it, as shown in figs; 3 ande.

The inkstand is filled by placing the plane of itsbase in a vertical position, and pouring the ink through the pen-.orifice E, tig. 3. The opening of D into C is level with, and it is desirable that` it should extend the entire width of the floor of, D, which slopes slightly upwards froin'C, so that upon contraction of the air in B, any ink which may have owed into D will descend into C, and thence re-enter the reservoir. E is the fountaintube, Isloping at aboutforty-iive degrees to the perpendicular face ofthe inkstand'. I

The defect inV ordinary fountain-inkstands, which this inventionis intended to overcome, is theirljliability to overflow, from thevariations of temperature. This fact, may' be exemplified as-follows: Suppose the ink to occupy but a portionof the reservoir, at the ordinary day-temperature, then, when -the inkstand is. exposed to a coldenatmosphere, a condition generally fulfilled at night, and more especially during the-winter season, the air in the space above the ink will contract, and the pressure ofthe atmosphere upon .the ink in the duct will canse it to re-enter the reservoir. This recession of the ink in the duct will permit the'access of so much air to the confined space as may he required toriestablish an equilibrium between the interior and exterior pressure. On the succeeding day, when the temperature .is higher, the air in the reservoir will expand, and having no means of egress, will displace the ink, and cause it to tlow from the fountain-tube over the exterior'offthe inkstand; and this overflow will recur at 'every' considerable variation of temperature.

In my improvement, this overflow of ink is received and retained in the chamber D, which is so arranged, in connection with the duct- C, thatlupon contraction of the air in the reservoir, this volume of ink will re-enter the reservoir instead of an equal increment of air. The area of the reservoir bears .such relation to the capacity of the overflow-chamber as to render the overflow of the latter impossible from .any variations of temperature to which an inkstand is exposed.

Having' thus described my invention, what I claim as new, and desire to secure by Iietters Pat'ent, is-

The overflow-chamber D, in combination with a fountain-inkstnnd, substantially as herein show-n and described;

N. GRAY BARTLETT.

Witnesses:

HInAw Kxownns, y Guo. F. BA'n'rLu'rr. 

